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Operations and Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Inventories [Table Text Block] |
Inventories | March 31, 2016 |  |  | December 31, 2015 |
Millions |  |  |
Fuel (a) |  | $56.5 |  |  |  | $58.1 |
Materials and Supplies | 49.0 |  |  | 49.1 |
Raw Materials | 2.6 |  |  | 2.7 |
Work in Progress | 0.8 |  |  | — |
Finished Goods | 7.4 |  |  | 7.5 |
Reserve for Obsolescence | (0.3 | ) |  | (0.3 | )
Total Inventories |  | $116.0 |  |  |  | $117.1 |
(a) | Fuel consists primarily of coal inventory at Minnesota Power.
Prepayments and Other Current Assets [Table Text Block] |
Prepayments and Other Current Assets | March 31, 2016 |  |  | December 31, 2015 |
Millions |  |  |
Deferred Fuel Adjustment Clause |  | $12.4 |  |  |  | $10.6 |
Restricted Cash (a) | 11.5 |  |  | 5.6 |
Other | 17.6 |  |  | 19.5 |
Total Prepayments and Other Current Assets |  | $41.5 |  |  |  | $35.7 |
(a) | Restricted Cash includes collateral deposits required under ALLETE Clean Energy’s loan agreements and cash pledged as collateral for U.S. Water Services’ standby letters of credit.
Other Current Liabilities [Table Text Block] |
Other Current Liabilities | March 31, 2016 |  |  | December 31, 2015 |
Millions |  |  |
Customer Deposits |  | $14.0 |  |  |  | $15.1 |
Power Purchase Agreements | 23.6 |  |  | 23.3 |
Other | 45.2 |  |  | 47.7 |
Total Other Current Liabilities |  | $82.8 |  |  |  | $86.1 |
Other Non-Current Liabilities [Table Text Block] |
Other Non-Current Liabilities | March 31, 2016 |  |  | December 31, 2015 |
Millions |  |  |
Asset Retirement Obligation |  | $136.2 |  |  |  | $131.4 |
Power Purchase Agreements | 131.9 |  |  | 138.1 |
Contingent Consideration (a) | 36.7 |  |  | 36.6 |
Other | 42.3 |  |  | 42.9 |
Total Other Non-Current Liabilities |  | $347.1 |  |  |  | $349.0 |
(a) | Contingent Consideration relates to the estimated fair value of the earnings-based payment resulting from the U.S. Water Services acquisition. (See Note 3. Acquisitions and Note 5. Fair Value.)
Supplemental Statement of Cash Flows Information [Table Text Block] | Supplemental Statement of Cash Flows Information.
Three Months Ended March 31, | 2016 |  |  | 2015 |
Millions |  |  |
Cash Paid During the Period for Interest – Net of Amounts Capitalized |  | $19.6 |  |  |  | $15.3 |
Cash Paid During the Period for Income Taxes |  | $0.1 |  |  |  | $0.1 |
Noncash Investing and Financing Activities |  |  |  |  |
Decrease in Accounts Payable for Capital Additions to Property, Plant and Equipment | $(25.6) |  | $(32.2)
Capitalized Asset Retirement Costs |  | $3.5 |  |  |  | $1.2 |
AFUDC–Equity |  | $0.9 |  |  |  | $0.9 |
Contingent Consideration | — |  |  |  | $35.7 |

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